Supplemental draft device for furnaces.



30.881366. PATENTED MAR. 10, 1908.

J. 0. TELLBR. SUPPLEMENTAL DRAFT DEVICE FOR FURNACES.

APPLICATION FILED MAY 11, 1907.

o o 0 o-0 o 0 l Wfnesses: [r2 venforf 1:4 M Z fi jfizww Q 1 By/I/S flfiwneys Y 5W nurse snares earner ores.

JOHN (l. TELLER, Ob MINNEAPOLIS, MINNESOTA, ASSIGNOR Oi FORTY-NINE ONE-HUN- DREDTHS TO ZAltAll (F. REBORN, OF MINNEAPOLIS, MINNESOTA, AND WILLIAM T.

(OLBORN, OF hANSAS CITY, MISSOURI.

SUPPLEMENTAL DRAFT DEVICE FOR FURNACES.

Application filed May 11, 1907.

To all whom it may concern:

Be it known that I, JOHN C. TELLER, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State 0' Minnesota, have invented certain new and useful Improvements in Sup lemental Draft Devices for Furnaces; and do hereby declare the following to be a full, clear, and exact descri )tion of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide a sup leinental draft device for furnaces, and to t llS end it consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

The device is especially adapted for application to the door of a furnace, and when so applied, it affords means for introducing air directly upon the burning products of com bustion, and this serves to more complete combustion. Such a device, therefore, not only serves to abate the smoke nuisance, but effects a great saving in fuel.

The improved sup lemental draft device in its preferred form is illustrated in theaccompanying drawings, wherein like characters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a view in elevation with some parts broken away, showing the improved draft device applied to the door. of a furnace. Fig. 2 is a view of the parts shown in Fig. 1, partly in plan and partly in horizontal section. Fig. 3 is a transverse vertical section taken on the line 9: w of Fig. 2; andFig. tie a view in elevation with parts broken away, looking at the inner end or nozzle portion of the draft device.

The numeral 1 indicates a furnace door which may be of the usual or any suitable construction, but is ircferably mounted so that it may be movefl to and from an open position while held parallel to its seat on the door 0 ening. To accomplish this, it is pivotal y connected at its intermediate up.-

per and lower portions to the prongs of a yoke 2, which in turn is hinged or pivotally connected to the furnace by means of hinge bolts 3 passed through lugs 4 of said yoke and through lugs 5 on the furnace adjacent to the door opening.

Specification of Letters Patent.

Patented March 10, 1908.

Serial No. 373,066.

The numeral 6 indicates a yoke-like hand piece applied to the outer plate of the door.

The draft device, in its preferred form, is made up of a neck portion 7 and a twyer head 8. In cross section, the neck portion 7 is oblong, and atits outer end it is bolted to the outer plate of the door 1 and registers with an inlet port 9 formed therein. The twyer head 8 is bolted to the inner end of the neck 7 and has a port 10 that registers therewith. cross section, the twyer head 8 is cylindrical, and for convenience in construction and in the assembling of the parts it is made up of two sections having abutting flanges 8 that are bolted or otherwise rigidly secured to gether. The ends of the cylindrical head 8 are closed, but the innermost semi-cylindrical section of the said head is provided with a multiplicity of perforations or air passages 11.

Within the cylindrical head 8 is a semi-cylindrical deflecting plate 12 that extends from end to end of the said cylindrical head and is secured at its ends to the end walls thereof. This deflecting plate 12 is set concentric to and radially co-extensive with the outermost semi-cylindrical section of the said head 8. When the door is closed, the twyer head 8 is projected into the furnace and over a portion of the burning fuel which is contained within the lire box, and in designating directions, as inward and outward, outward is always taken to mean in a direction toward the door opening.

The numeral 13 indicates a damper or .valve which is pivotally attached at 14 to the outer face of the door 1, and is adapted to be moved into position to close or to open to any desired extent the air inlet port 9 of the said door.

The operating of the device described, is substantially as follows: The air which will be drawninto the lire box through the port 9 and neck 7, upon entering the twyer head 8, will strike the semi cylindrical deflecting plate 12 and will be deflected into two currents which, traveling circular courses within the twyer head will again unite with force in the space between the perforated inner head section and the concave side of the deflecting plate 12 and will be expelled with great force through the air passages l 1 into the furnace, where the air in a multiplicity of line streams will be comminglcd and thoroughly mixed efficient for the purposes had in view.

5 The twyer head is of considerable length,

and is projected a considerable distance through the door opening and into the fire box, so that if applied to an ordinary hinged door, it would, in many instances, not find suflicient clearance in the door opening to permit the door to be swung to and from an 0 en position. illhstrated in the drawings and above described,'-n1akes it ossible to pull the twyer head approximate y on a straight line outward throu h the door opening.

What I c aim is 1. The combination with a furnace door, of a transversely elongated neck portion se-- cured to said door and receiving air from the exterior thereof, a cylindrical head applied to the inner end of said neck and recelving air therefrom, said head having perforations in'its most inwardly projecting portion, and

an approximately senii cylindrical deflector located within said head and extending from end to end thereof, with its convex portion alined with said neck and-with its concave The manner of mountin.g,-

surface facing the perforations of v said head,

an approximately semi-cylindrical deflect ing plate concentrically applied within said twyer head and positioned with its convex surface turned toward and alined with said neckportion, substantially as described.

57 The combination with a furnace door having a port 9, of a neck portion 7 secured to said door and connected to said port, a twyer head. 8 secured to the inner end of said neck portion 7-and made up of two approximately semi-cylindrical sections, the inner of which sections is provided with perforations 11. for

the injection 'otair into the furnace, and a semi-cylindrical deflecting plate 12 secured within said twyer head concentric to and coextensive with the outer section of said twyer head, substantially as described.

In testimony whereof I aflix my signature I in presence of two witnesses.

JOHNC. TELLERQ Witnesses M. E. RONEY, F. D. MERCHANT. 

